Question

23.A combination of lenses for
a high power microscope
contains 3 lens of focal lengths
20 cm.40 cm and -50 cm. Find
the power and and focal length
of the combination.
O P=5.5D, f=81.18cm
O P=5.15 D, f=18. 18 cm
O P=5.51D ,f=18 cm
O P-5.5 D, f=18.18cm
​

Answer 1

Answer:

Answer is D

Explanation:

Power of combination of lens is sum of power of each lens.